The Precision Micrometer Screw Gauge

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This micrometer is composed of a frame, anvil, thimble, and ratchet stop. Used in most mechanical trades for precision measurement. Micrometers use the principle of a screw to amplify small distances that are too small to measure. The accuracy of a micrometer derives from the accuracy of the thread form.

Source

Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)

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